        
      (and (= person :3rd) (= number :plur)
           ir-type)
-     (str stem "íssaient")
+     (str stem "issaient")
      ;; </third person plural imperfecto>
            
      :else

     (str stem "iez")
           
     (and (= person :2nd) (= number :plur) ir-type)
     (str stem "íssiez")
                 
     ;; </second person plural imperfecto>
           

     (str stem "ais")

     (and (= person :1st) (= number :sing) ir-type)
     (str stem "issais")

     (and (= person :2nd) (= number :sing) er-type)
     (str stem "ais")
           
     (and (= person :2nd) (= number :sing) ir-type)
     (str stem "issais")
              
     (and (= person :3rd) (= number :sing) er-type)
     (str stem "ait")
           
     (and (= person :3rd) (= number :sing) ir-type)
     (str stem "issait")
           
     (and (= person :1st) (= number :plur) er-type)
     (str stem "ions")
           
     (and (= person :1st) (= number :plur) ir-type)
     (str stem "issions")
           
     ;; <second person plural imperfecto>
           
